Duplex envelope



' May 18, 1926. 1,584,961-

F. J. PARKS DUPLEX ENVELOPE Filed Sept. 22, 1924 F6 7 //vv7'o/?' 1 I fkEw/WKJAMESQI Patented May '18, 1926.

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FREDERICK JAMES PARKS, OF CLEVELAND, OHIO.

DUPLEX ENVELOPE.

Application filed September relates to duplex envelopes having one pocket which maybe sealed to carry firstclass matter and a second pocket in which cheaper class matter 1s carried. The cheaper class matter is carried 1n an accessible 1 pocket portion of an improved duplex envelope of the self-clasp type. One form of this self-clasp envelope, as a single envelope, is patented to me by ULS. Patent No. 1,- 459,414. One type of machine for auto- 1 matically manufacturing said self-clasp envelopeis illustrated in my U. S. Patent- No.

1,316,737; and an improved process for manufacturing said self-clasp envelope having an automatically and detachably interlocked retaining pocket and closure flap is patented to me by U. S. Patent No. 1,459,-

415. The improved duplex envelope forming the subject-matter of this application is manufactured from a blank designed to r Y be automatically operated upon in the manner described'and claimed in said process Patent No. 1,459,415.

The annexed drawing and the following description set forth in detail certain means embodying my invention, such means disclosing, however, but one of the various forms in which the principle of the invention may be applied.

In said annexed drawing:

Figure 1 is a plan view of the blank from which the illustrated form of my improved duplex envelope is made;

Figure 2 is a view illustrating the state of the blank shown in Figure 1 after the completion of the initial folding thereof;

Figure 3 is a view illustrating the form of said blank after the completion of the second folding thereof, showing the first step in the formation of the flap-receiving pocket formed adjacent the mouth of the envelope which is adapted to receive the cheaper class mail matter; Figure 3 also shows the folding of the blank to form a pocket for receiving first-class mail matter, or other matter, if it is not desired to seal the last-named pocket.

Figure t is a view illustrating the form of said blank after the completion of said flap-receiving pocket and the interlocking .of the closure flap therewith, the blank then being ready to: receive the gum by means 22, 1924. Serial No. 738.991.

f which certain blank side flaps are secured to the body portion to close the lateral edges of the two pockets adapted to receive the two kinds of filling material;

Figure 5 represents the blank shown in Fig. 4 after applying the gum for sealing the side flaps;

Figure 6 represents a View of the completed envelope, said blank side flaps having been folded over and secured in part to that portion of the envelope having a pocket for cheaper class mail matter, in part to the blank portion forming one wall of the pocket for receiving first-class mail matter, and in part to the above-mentioned fiapreceiving pocket, certain lateral tabs, hereinafter fully described, having also been folded over and secured beneath said side flaps in part to said flap-receiving pocket and in part to said blank portion forming one wall of the pocket for receiving the first-class mail matter; and

Figure 7 represents, upon an enlarged scale. a longitudinal section, taken in the plane indicated by the line VIIVII, Fig. 6.

Referring to the annexed drawing in which the several parts are indicated by the same respective ordinals in the different views, I show in Figure 1 a blank from which my improved envelope is made, the same having substantially rectangular front and back plies or portions 1 and 2 integrally joined in a transverse plane 3, joining edge 3 forming a permanent closure along that edge of the completed envelope which shall serve as the bottom of the pocket designed to receive the cheaper class mail matter. One of the plies 1 and 2, as for example the ply 1, is wider than the ply 2, due to integral side flaps or extensions 4, formed along the opposite lateral side edges, these side flaps 4; being adapted to be folded over behind and scaled down upon corresponding lateral edge portions of other blank parts, hereinafter fully described, so as to afford permanent closures along the opposite lateral edges of both the pockets of the completed envelope which are adapted to receive the first-class mail matter and the cheaper class mail matter, respectively.

The free edge of the front ply 1 is adapted to be triple folded along the lines 11, 12 and 18 to form a closure flap adapted to be detachably interlocked in' doubled form with a two-ply pocket formed by double,

folded parts and G of the back ply 2, said double folded parts 5 and (i being positioned intermediate the ends of the back ply The formation of the double ply pocket 5 and C and the closure flap automatically de tachably interlocked therewith is shown in Figure -1- and is accon'iplished by the process patented to me by Said U. S. atent No. 1359315, in machines of which one type is illustrated in my said Patent No. 1 ,316,- 737. As also fully described and shown in said Patent K0. 1,459,-l15, the blank forma tion is such as to align the section 10 o:' the back ply 2 with the section 11 ot' the front ply 1 to form an envelope month, said mouth furnishing an entrance to a pocket for cheaper class mail matter, in the duplex enveloie herein shown and de- .scribed.

In the form of blank shown in Figure 1, I have extended the back ply 2 to form a tree end portion 15 having an extreme terminal edge portion 16, for the purpose now to be described. When the blank is subjected to its second folding ogeration to produce the form ehown in Figure 3 the member 15 of the back ply 2 has been folded back and down upon the closed end part of id back ply to form the walls of a pocket for first-class mail matter. This pocket for the first-class mail matter sealed along the la eral edges by the side extensions of the "front ply 1 when said extensions '-lare folded back over and upon the rear of the back ply as plainly shown in Figure 6.

The wall member 15 of the first-class mail pocket is tornrd with a window adapted to display the address of the mail receiver placed upon the pocket contents as well understood. and. the extreme terminal part 16 of said member 15 is scored. along a line 18. and adapted to be sealed upon the member 2 to close the pocket containing" the firstclas-i mail matter. The said terminal part to is preferably provided with adhesive 17. as plainly shown in l igure Q. or the same may be applied by the user, as desired. In order that the first-class mail matter 1 be readily accessible, the member 1; formed with multiple perforations along the line end notches l9 being formed in the member 15 whereby an envelope opener may be readily applied.

In order lO JlOlH the twoply pocket :3 and tseeurely to the envelope. bony. I form side tabs ll upon the back ply 2 adjacently iorward of the mouth line 10. as plainly shown in Figure 1 said side tabs l-lbeing: adapter. when the blank is folded into the form shown in Figure l. to overlap the double ply portion 5, and the blank portion 15. so that when the side flaps lare turned over and scaled down by neans of the gum ll said tabs ll assume the position \wn plan-11y 1n Figaro the adhe .e 21 spread ing enough to seal the flaps l to the portion it is evident from an inspection oi Figre 6 that the side llaps -1- are folded h ck and secured to the closed end of the oh an portion 2 adjacent the edge '3 1nd also to he free end of said blank portion 2 formed by the part 15. The side tabs l-l secured to the tree end portion 17 and the edges of the pocket tiap. The manner the application or" the 1 ill to the envelope blank in the form i own in l' igure l. so as to creat the road 1 Figure 5. la t'ul i one: shown in .ly de..'cr in my and Patent No. l. l. l' and is also plainly shown and d inibed in my pending application Se 'ial ho. ($68,200.

it will be evident from an inspection of Figures 1 and 5 that the flap sections 7. 8 and S) are so tapered toward the free end of the blank portion 1. that. when the side flaps l are loloea'l over and sailed to form ateral closures. the sealed portionsof said iteral flaps l,- do not extend inwardly as far as tle at'iyacent portions of the Hap section 7. Therefore, lap portion 7 is not sealed down by the side flaps l but is free to be removed from the {lap-receiving pocket. for the reception of the desired tiller of cheaper claes matte", for postal inspection. etc. together with the other flap sections S and 9, by a pull upon the terminal edge of said tiap section if),

It will be evident. that the completed envelope will be furnished to the user in the form shown in Fig re 6, the texminal porion it} not eing: :-:ealed but ready for sealeither through the medium of adhesive 17 or by adhes' r, plied tor the purpose by the us erl it i st class mail matter is carried. F0 soon as the lllf-d-(lRFS mail matter ha..- been inserted in the pocket in: iediatciy under the member l5.

ll the tiller pocket formed under the membe 3 i ntil/ed lor unsealed matter, sue

circular: nondence ctr ';.Jnl;=cr to would iot be provided with a l x but would be tucked in the pocket h the terminal ad the tiller to retain the latter. as will l i end. l claim is:

duplex envelope formed from a d bl cons riling oi a re -tantra 'im o'l" which a part intermediate to be double 'lohled. the tree cud. l portion beine' folded back upon the "e end of said portion which is bel'olde'l part. said rcetan raide oppm yond thitl double flnlar port on being connected to a wider second portion having side edges to be creased and folded and whose "tree end is to .ple creaeed and folded. said cnvrloyjie having said two portions folded upon one another, a two-ply pocket. lap i m'merl on said first-named portion from fold d Skid double part to form a pocket llClJilCGllt the lilll month of the envelope, side flaps formed along opposite sides of said second-named portion and folded back and secured to the side edges of both ends ofthe first-named portion, and a three-ply closure flap formed on the free end of said second-named portion and folded over said pocket flap and detachabl y interlocked in doubled form in said pocket,

2. A duplex envelope formed from a blank, said blank consisting of a reetangu lar portion of which a part intermediate ends, is to be double folded, the free end of said portion being folded back upon the opposite end of said portion which is be yond said doubled folded part, means for sealing said free end to the opposite end of said portion, said rectangular portion being connected to a wider second portion having side edges to be creased and folded and whose free end is to be triple creased and folded, said envelope having said two portions folded upon one another, a twoply pocket flap formed on said first-named portion from said double folded part to form a pocket adjacent the mouth of the envelope, side flaps formed along opposite sides of said second-named portion and folded back and secured to the side edges of both ends of the first-named portion, and a three-ply closure flap forind on the free end of said second-named portion and folded over said pocket flap and detachably interlocked in doubled form in said pocket.

3. A duplex envelope formed from a blank, said blank consisting of a rectangular portion of which a part intermediate its ends is to be double folded, the free end of said portion being shorter than the opposite end which is beyond said double folded part and heme; folded back upon said opposite end, said rectangular portion being connected to a wider second portion having side edges to be creased and folded and whose free end is to be triple creased and folded, said envelope having said two portions folded upon one another, a two ply pocket flap formed on said first-named portion from said double folded part to form a pocket adjacent the mouth of the envelope, side flaps formed along opposite sides of said second-named portion and folded back and secured to the side edges of the free end of said first-named portion, the reinainder of said side flaps being folded back and secured to the side edges of the opposite, closed end of said first-named portion, and a three ply closure flap formed on the free end of said second-named portion and fold ed over said pocket flap and detachably interlocked in doubled form in said pocket.

- 4:. A duplex envelope formed from a blank, said blank consisting of a rectangular portion of which a part intermediate its ends is to be double folded, side tabs formed on said portion adjacent-1y forward of said double fold, the free end of said portion being folded back upon the opposite end of said portion which'is beyond said double folded part, said rectangular portion being connected to a wider second portion having side edges to be creased and folded and whose free end is to be triple creased and folded, said envelope having said two portions folded upon one another, a two ply pocket formed adjacent the mouth of the envelope on said first-named portion from said double folded part, side flaps formed along opposite sides of said second-named portion, said side flaps being folded back and secured to the side edges of both the free and closed ends of said first-named portion and to said pocket flap and said side tabs being folded back and secured to the corresponding edges of said free end and said pocket flap, said side flaps covering said side tabs, and a three ply closure flap formed on the free end of said second-named portion and folded over said pocket flap and detachably interlocked in doubled form in said pocket.

5. A duplex envelope formed from a blank, said blank consisting of a rectangular portion of which a part intermediate its ends is to be double folded, the free end of said portion having a narrow terminal part and being folded back upon the opposite end of said portion which is beyond said double folded part, gum secured transversely of said free end adjacent the extreme edge thereof, transverse perforations formed in said free end adjacent to, and inwardly of, said gum, said free end being formed with a window, said rectangular portion being connected to a wider second portion having side edges to be creased and folded and whose free end is to be triple creased and folded, said envelope having said two portions folded upon one another, a two ply pocket flap formed on said first-named port-ion from said double folded part to form a pocket adjacent the mouth of the envelope, side flaps formed along opposite sides of said second-named portion and folded back and secured to the side edges of both the free and closed end of said first-named portion, and a three-ply closure flap formed on the free end of said SGCOHtl-IIHDIGCl portion and folded over said pocket flap and detachably interlocked in doubled form in said pocket.

' 6. A duplex envelope formed from a blank, said blank consisting of a rectangular portion of which a part intermediate its ends is to be double folded, the free end of said portion being folded back upon the opposite end of said portion which is beyond said double folded part, said free end being formed with a terminal member narrower than the body portion of said end, said rec tangular portion being connected to a wider second portion having side edges to be creased and folded and Whose free end is to be triple creased and folded, said envelope having said two portions folded upon one another, a two-ply pocket flap formed on id first-named portion from said double folded part to form a pocket adjacent the lnoufh of me envelope, side flaps formed along opposite sides of said second-named portion and folded back and secured to the side edges of both the free and closed ends of said first-named portion, and :1 three-ply closure flap formed on the free and of said second-manned portion and folded OVOY said pocket flap and detachably interlocked in doubled form in said pocket.

Signed by me this 18th day of August 192%.

FREDERICK JAMES PARKS. 

